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Neutrons tend to perform a net drift from regions of high flux to regions of low flux at a rate proportional to the flux gradient.
Assumption of diffusion approximation
size of reactor (the larger, the less significant is leakage relative to other neutron fates); amount of parasitic absorption (in structure and coolant);
amount of fuel (to cause further fissions)
Criticality depends on...
Maximum at centre, zero at edges; a cosine axially (zero at the ends, maximum in the middle); a Bessel function radially (zero at the outer radius, maximum in the middle)
Flux distribution when critical in cylindrical reactor
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